In all areas of special flood hazards, compliance with the applicable
requirements of the Uniform Construction Code (N.J.A.C. 5:23) and
the following standards, whichever is more restrictive, is required.
A. Anchoring.
(1) All new construction and substantial improvements shall be anchored
to prevent flotation, collapse, or lateral movement of the structure.
(2) All manufactured homes to be placed or substantially improved shall
be anchored to resist flotation, collapse or lateral movement. Methods
of anchoring may include, but are not to be limited to, use of over-the-top
or frame ties to ground anchors. This requirement is in addition to
applicable state and local anchoring requirements for resisting wind
forces.
B. Construction materials and methods.
(1) All new construction and substantial improvements shall be constructed
with materials and utility equipment resistant to flood damage.
(2) All new construction and substantial improvements shall be constructed
using methods and practices that minimize flood damage.
C. Utilities.
(1) All new and replacement water supply systems shall be designed to
minimize or eliminate infiltration of floodwaters into the system;
(2) New and replacement sanitary sewage systems shall be designed to
minimize or eliminate infiltration of floodwaters into the systems
and discharge from the systems into floodwaters;
(3) On-site waste disposal systems shall be located to avoid impairment
to them or contamination from them during flooding; and
(4) For all new construction and substantial improvements, the electrical,
heating, ventilation, plumbing and air-conditioning equipment and
other service facilities shall be designed and/or located so as to
prevent water from entering or accumulating within the components
during conditions of flooding.
D. Subdivision proposals.
(1) All subdivision proposals and other proposed new development shall
be consistent with the need to minimize flood damage;
(2) All subdivision proposals and other proposed new development shall
have public utilities and facilities, such as sewer, gas, electrical,
and water systems, located and constructed to minimize flood damage;
(3) All subdivision proposals and other proposed new development shall
have adequate drainage provided to reduce exposure to flood damage;
and
(4) Base flood elevation data shall be provided for subdivision proposals
and other proposed development.
E. Enclosure openings. All new construction and substantial improvements
having fully enclosed areas below the lowest floor that are usable
solely for the parking of vehicles, building access or storage in
an area other than a basement and which are subject to flooding shall
be designed to automatically equalize hydrostatic flood forces on
exterior walls by allowing for the entry and exit of floodwaters.
Designs for meeting this requirement must either be certified by a
registered professional engineer or architect or must meet or exceed
the following minimum criteria: A minimum of two openings in at least
two exterior walls of each enclosed area, having a total net area
of not less than one square inch for every square foot of enclosed
area subject to flooding shall be provided. The bottom of all openings
shall be no higher than one foot above grade. Openings may be equipped
with screens, louvers, or other covering or devices, provided that
they permit the automatic entry and exit of floodwaters.
In all areas of special flood hazards where base flood elevation data has been provided as set forth in §
388-9, Basis for establishing areas of special flood hazard, or in §
388-16B, Use of other base flood and floodway data, the following standards are required:
A. Residential construction.
(1) For Coastal A Zone construction see §
388-21, Coastal high-hazard area and Coastal A Zone.
(2) New construction and substantial improvement of any residential structure
located in an A or AE Zone shall have the lowest floor, including
basement, together with the attendant utilities and sanitary facilities,
elevated at or above the base flood elevation plus one foot or as
required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive.
(3) Require within any AO or AH Zone on the municipality's DFIRM
that all new construction and substantial improvement of any residential
structure shall have the lowest floor, including basement, together
with the attendant utilities and sanitary facilities, elevated above
the depth number specified in feet plus one foot, above the highest
adjacent grade (at least three feet if no depth number is specified),
and require adequate drainage paths around structures on slopes to
guide floodwaters around and away from proposed structures.
(4) Buildings and structures constructed in whole or in part in special
flood hazard areas shall be designed and constructed in accordance
with the provisions contained in the International Residential Code,
New Jersey Edition 2015, Section R322, Flood-Resistant Construction
and all subsequent codes.
B. Nonresidential construction. In an area of special flood hazard, all new construction and substantial improvement of any commercial, industrial or other nonresidential structure located in an A or AE Zone (for Coastal A Zone construction, see §
388-21, Coastal high-hazard area and Coastal A Zone) shall have the lowest floor, including basement, together with the attendant utilities and sanitary facilities, either 1) elevated to or above the base flood elevation plus one foot or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive; and 2) require within any AO or AH Zone on the municipality's DFIRM to elevate above the depth number specified in feet plus one foot, above the highest adjacent grade (at least three feet if no depth number is specified), and require adequate drainage paths around structures on slopes to guide floodwaters around and away from proposed structures, or:
(1) Be floodproofed so that below the base flood level plus one foot
or as required by ASCE/SEI 24-14, Table 6-1, whichever is more restrictive,
the structure is watertight with walls substantially impermeable to
the passage of water;
(2) Have structural components capable of resisting hydrostatic and hydrodynamic
loads and effects of buoyancy; and
(3) Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting the applicable provisions of this subsection. Such certification shall be provided to the official as set forth in §
388-16C(2)(b).
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
388-18A(2).
(2) All manufactured homes to be placed or substantially improved within
an area of special flood hazard shall:
(a)
Be consistent with the need to minimize flood damage.
(b)
Be constructed to minimize flood damage.
(c)
Have adequate drainage provided to reduce exposure to flood
damage; and
(d)
Be elevated on a permanent foundation such that the top of the
lowest floor is at or above the base flood elevation plus one foot
or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive.
Located within areas of special flood hazard established in §
388-9 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
A. Prohibit encroachments, including fill, new construction, substantial
improvements, and other development, unless a technical evaluation
demonstrates that encroachment shall not result in any increase in
flood levels during the occurrence of the base flood discharge.
B. If §
388-20A is satisfied, all new construction and substantial improvements must comply with Article
V, Provisions for Flood Hazard Reduction.
C. In all areas of special flood hazard in which base flood elevation
data has been provided and no floodway has been designated, the cumulative
effect of any proposed development, when combined with all other existing
and anticipated development, shall not increase the water surface
elevation of the base flood more than 0.2 foot at any point.
Coastal high-hazard areas (V or VE Zone) and Coastal A Zones are located within the areas of special flood hazard established in §
388-9. These areas have special flood hazards associated with high-velocity waters from tidal surges and hurricane wave wash; therefore, the following provisions shall apply.
A. Location of structures.
(1) All buildings or structures shall be located landward of the reach
of the mean high tide.
(2) The placement of manufactured homes shall be prohibited, except in
an existing manufactured home park or subdivision.
B. Construction methods.
(1) Elevation. All new construction and substantial improvements shall
be elevated on piling or columns so that:
(a)
The bottom of the lowest horizontal structure member of the
lowest floor (excluding the piling or columns) is elevated to or above
the base flood elevation plus one foot or as required by ASCE/SEI
24-14, Table 4-1, whichever is more restrictive; and
(b)
With all space below the lowest floor's supporting member
open so as not to impede the flow of water, except for breakaway walls
as provided for in § 188-21B(4).
(2) Structural support.
(a)
All new construction and substantial improvements shall be securely
anchored on piling or columns.
(b)
The pile or column foundation and structure attached thereto
shall be anchored to resist flotation, collapse or lateral movement
due to the effects of wind and water loading values, each of which
shall have a one-percent chance of being equaled or exceeded in any
given year (one-hundred-year mean recurrence interval).
(c)
Prohibit the use of fill for structural support of buildings
within Zones V1-30, VE, V, and Coastal A on the community's FIRM.
(3) Certification. A registered professional engineer or architect shall develop or review the structural design specifications and plans for the construction and shall certify that the design and methods of construction to be used are in accordance with accepted standards of practice for compliance with the provisions of §
388-21B(1) and 2(a) and (b).
(4) Space below lowest floor.
(a)
Any alteration, repair, reconstruction or improvement to a structure
started after the enactment of this chapter shall not enclose the
space below the lowest floor unless breakaway walls, open wood latticework
or insect screening are used as provided for in this section.
(b)
Breakaway walls, open wood latticework or insect screening shall
be allowed below the base flood elevation, provided that they are
intended to collapse under wind and water loads without causing collapse,
displacement or other structural damage to the elevated portion of
the building or supporting foundation system. Breakaway walls shall
be designed for a safe loading resistance of not less than 10 pounds
per square foot and no more than 20 pounds per square foot. Use of
breakaway walls which exceed a design safe loading of 20 pounds per
square foot (either by design or when so required by local or state
codes) may be permitted only if a registered professional engineer
or architect certifies that the designs proposed meet the following
conditions:
[1]
Breakaway wall collapse shall result from a water load less
than that which would occur during the base flood.
[2]
The elevated portion of the building and supporting foundation
system shall not be subject to collapse, displacement or other structural
damage due to the effects of wind and water load acting simultaneously
on all building components (structural and nonstructural). Water loading
values used shall be those associated with the base flood. Wind loading
values used shall be those required by applicable state or local building
standards.
[3]
If breakaway walls are utilized, such enclosed space shall be
used solely for the parking of vehicles, building access, or storage
and not for human habitation.
[4]
Prior to construction, plans for any breakaway wall must be
submitted to the Construction Code Official or Building Subcode Officials
for approval.
C. Sand dunes. Prohibit man-made alteration of sand dunes within Coastal
A Zones, VE and V Zones on the community's DFIRM which would
increase potential flood damage.
D. Prevention or abatement of unlawful conditions. In case any building
or structure is erected, constructed, altered, repaired, converted
or maintained or any building or structure is used in violation of
this chapter or any regulations made pursuant thereto, the proper
Township authorities, in addition to other remedies, may institute
any appropriate action or proceedings to prevent such unlawful erection,
construction, reconstruction, alteration, repair, conversion, maintenance,
or use; to restrain, correct or abate such violation; to prevent the
occupancy of said building, structure or land; or to prevent any illegal
act, conduct, business or use in or about such premises.